crowdsec/pkg/cwhub/remote.go

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package cwhub
import (
"fmt"
"io"
"net/http"
)
// RemoteHubCfg is used to retrieve index and items from the remote hub.
type RemoteHubCfg struct {
Branch string
URLTemplate string
IndexPath string
}
// urlTo builds the URL to download a file from the remote hub.
func (r *RemoteHubCfg) urlTo(remotePath string) (string, error) {
if r == nil {
return "", ErrNilRemoteHub
}
// the template must contain two string placeholders
if fmt.Sprintf(r.URLTemplate, "%s", "%s") != r.URLTemplate {
return "", fmt.Errorf("invalid URL template '%s'", r.URLTemplate)
}
return fmt.Sprintf(r.URLTemplate, r.Branch, remotePath), nil
}
// fetchIndex downloads the index from the hub and returns the content.
func (r *RemoteHubCfg) fetchIndex() ([]byte, error) {
if r == nil {
return nil, ErrNilRemoteHub
}
url, err := r.urlTo(r.IndexPath)
if err != nil {
return nil, fmt.Errorf("failed to build hub index request: %w", err)
}
resp, err := hubClient.Get(url)
if err != nil {
return nil, fmt.Errorf("failed http request for hub index: %w", err)
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
if resp.StatusCode == http.StatusNotFound {
return nil, IndexNotFoundError{url, r.Branch}
}
return nil, fmt.Errorf("bad http code %d for %s", resp.StatusCode, url)
}
body, err := io.ReadAll(resp.Body)
if err != nil {
return nil, fmt.Errorf("failed to read request answer for hub index: %w", err)
}
return body, nil
}